熱暴露對7A12-T7352鍛件組織和性能的影響Effect of thermal exposure on microstructure and mechanical properties of 7A12-T7352 forging

采用室溫拉伸力學性能測試和透射電鏡觀察等研究熱暴露對7A12-T7352自由鍛件微觀組織和力學性能的影響。結果表明，熱暴露溫度顯著影響合金的力學性能；當熱暴露溫度不高于125 ℃時，合金的強度略有且升高，且可以在較長時間內保持穩定；當熱暴露溫度高于150 ℃時，合金的強度隨著熱暴露時間的延長持續下降，熱暴露溫度越高，強度下降幅度越大。在高于150 ℃熱暴露過程中，h′相和h相的快速粗化是導致7A12自由鍛件強度下降的內在原因。

The microstructure and mechanical properties of 7A12-T7352 forging under different thermal exposure conditions were studied by TEM analysis and tensile test. The results show that thermal exposure temperature affects the mechanical properties of the forging significantly. When the alloy is exposed at 125 ℃ or lower, the strength will increase and then keep stable for a long time. When the thermal exposure temperature is higher than 150 ℃, the strength decreases obviously with increasing the thermal exposure time. Higher exposure temperature leads to greater decrease of the strength. The strength decreases due to the coarsening of h′ and h phases when the alloy exposed at temperature higher than 150 ℃.

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